We are currently experiencing issues with text messages sent through WorshipPlanning.com to AT&T wireless customers. Our text message service provider (Twilio) is aware of the issue and is actively working with AT&T on a resolution. It sounds like AT&T applied new "filtering" rules that are rejecting more text messages as spam.
We will post an update as soon as we get more information. Our apologies for any inconvenience this may be causing.